Vista - date formatting

I'm building a PowerShell script for ntbackup, starting with the date:
$today = get-date
Monday, March 31, 2008 7:48:58 PM

then the day of the week:
$day_of_week = $today.dayofweek
Monday

then the output file name:
$name_tag = get-date -uformat "%a"
$backup_bkf = get-date -uformat "%Y-%m-%d-$name_tag.bkf"
2008-03-31-Mon.bkf

But I really wanted to use the same time/date stamp value throughout.

Instead of this:
$backup_bkf = get-date -uformat "%Y-%m-%d-$name_tag.bkf"

How can I do this:
$backup_bkf = $today -uformat "%Y-%m-%d-$name_tag.bkf"

--
Rob Pettrey
Microsoft Small Business Specialist

$today = get-date

# multiple assignment
$day_of_Week, $name_tag = "$('{0:dddd},{0:ddd}' -f $today)".split(',')
$day_of_Week
$name_tag

# string concatenation
$backup_bkf = $($today.toString('yyyy-MM-dd')) + "-$name_tag.bkf"
$backup_bkf

# subexpression string expansion
$backup_bkf = "$($($today.toString('yyyy-MM-dd')))-$name_tag.bkf"
$backup_bkf

# safer subexpression string expansion - note the curly braces
$backup_bkf = "$($($today.toString('yyyy-MM-dd')))-${name_tag}.bkf"
$backup_bkf

# # # #

# other samples w/o $name_tag
$today = get-date
$backup_bkf = '{0:yyyy-MM-dd-ddd}.bkf' -f $today
$backup_bkf

$today = get-date
$backup_bkf = "$($today.toString('yyyy-MM-dd-ddd')).bkf"
$backup_bkf

--
Kiron

Excuse the typo, no subexpression needed:

# string concatenation
$backup_bkf = $today.toString('yyyy-MM-dd') + "-$name_tag.bkf"
$backup_bkf

--
Kiron

$today = get-date

# multiple assignment
$day_of_Week, $name_tag = "$('{0:dddd},{0:ddd}' -f $today)".split(',')
$day_of_Week
$name_tag

# string concatenation
$backup_bkf = $today.toString('yyyy-MM-dd') + "-$name_tag.bkf"
$backup_bkf

# subexpression string expansion
$backup_bkf = "$($today.toString('yyyy-MM-dd'))-$name_tag.bkf"
$backup_bkf

# safer subexpression string expansion - note the curly braces
$backup_bkf = "$($today.toString('yyyy-MM-dd'))-${name_tag}.bkf"
$backup_bkf

# other samples
$today = get-date
$backup_bkf = '{0:yyyy-MM-dd-ddd}.bkf' -f $today
$backup_bkf

$today = get-date
$backup_bkf = "$($today.toString('yyyy-MM-dd-ddd')).bkf"
$backup_bkf


--
Kiron

Kiron,

Perfect! Just what I needed!

I ended up with:

$backup_bkf = $today.toString('yyyy-MM-dd') + "-$name_tag.bkf"

since it seemed the most intuitive to me.

thanks again for the many examples! Very helpful!

--
Rob Pettrey
Microsoft Small Business Specialist


"Kiron" wrote: